#define button_pin 33
#define led_pin 32
int i=0;

void IRAM_ATTR toggleLED() {
  //write here code to change LOW->HIGH and HIGH->LOW
  digitalWrite(led_pin,!digitalRead(led_pin));
  i++;
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  //Serial.println("Hello, ESP32!");
  pinMode(led_pin, OUTPUT);
  pinMode(button_pin, INPUT);
  attachInterrupt(button_pin, toggleLED, FALLING);
  
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(1000); // this speeds up the simulation
  Serial.println(i);
}